used when a large number of people (e.g. pupils) coming (e.g. entrance) or leaving (e.g graduate) during the same period; also used for large amount of commodity, mass-produced objects (products 產品/产品, laptops, etc.) or supplies.

瓶

píng

ping4

objects in "bottle", vial, or flask. usually not too large so that people could takes by hands (e.g. lemonade, water, troche, , etc.)

"some" — general massifier. Only used in the form 一些, or without a number (e.g. after demonstratives).

行

xíng

hang4

groups of people traveling together, such as a trade commission or diplomats and aides visiting a foreign country: "国王一行人离开巴黎后十分兴奋" (having left Paris, the king and retinue were enthused). Note: almost only used in the form 一行人. — 行 is also read háng, see above.

匝

zā

zaap3

number of revolutions, times to go around

扎

zhā

ja1

In Cantonese usage, this is used in lieu of shù (束), e.g. a bundle of flowers "jar", "jug" — beverages such as beer, soda, juice, etc. (A recent loan-word from English, it may be considered informal or slang.)

"sets" — general mass-classifier for "sets" of objects (sets of, e.g. batteries 電池/电池, planets 行星, variables 變量/变量, data 数据/數據, objects 對象/对象, words 詞/词, or any sensible thing you want to name). A set is usually assumed to have two or more objects.But there are also exceptions: depends on what object the classifier is used for, the quantity of objects in sets may be assumed without context. When assumed, the classifier usually fallback to play a similar role to either 雙/双, 副 or 對/对: for example, when used for certain objects that come in pair, e.g. 搭檔/搭档, represented as 一組搭檔/一组搭档 (一對搭档/一对搭档 is valid), here the quantity of objects is always assumed to be two (i.e. one pair) in each set; Note that when used for other naturally-in-pair things, like chopsticks 筷子, represented as *一組筷子/一组筷子, here the quantity of objects is unspecified if no context specific it, as people never use 組/组 for chopsticks as a natural-in-pair object classifier (That is, except for certain objects like 搭檔/搭档, the classifier 組/组 won't fallback to 雙/双, 副 et al. when used for objects in pair.)